Cartographic skills
What you'll learn
- How to use atlas maps, latitude and longitude, and thematic maps to describe patterns.
- How to read Ordnance Survey maps using grid references, scale, direction and relief.
- How to interpret cross-sections, transects, photographs and sketch maps.
- How to turn map evidence into geographical inferences, not just descriptions.
What are cartographic skills?
Cartographic skills
Cartographic skills are the skills used to read, interpret, measure from, compare and create maps and map-based evidence.
In GCSE Geography, maps are not a separate “memory topic”. They appear across all three papers. You might use a map to describe where earthquakes occur, explain why settlements grow near transport routes, or infer tourist activity in a glaciated valley.
Maps are evidence
A map is not just something to locate places on. It gives evidence about patterns, relationships, change, and possible causes.
Atlas maps: global and regional patterns
An atlas map is a map usually showing a large area, such as the world, a continent, a country or a region. Atlas maps are useful for big-picture geography: global population distribution, migration flows, climate zones, tectonic plate boundaries, transport networks and relief.
Latitude and longitude
Latitude and longitude
Latitude measures how far north or south a place is from the Equator, in degrees. Longitude measures how far east or west a place is from the Prime Meridian, in degrees.
The Equator is 0° latitude. The Prime Meridian, which passes through Greenwich in London, is 0° longitude.
A location might be written as 51°N, 0°W. The first part is latitude, and the second part is longitude.
Describing distributions and patterns
Distribution and pattern
A distribution is where something is found. A pattern is the way it is arranged, such as clustered, linear, dispersed, coastal, inland, dense or sparse.
For example, global population is unevenly distributed. Large clusters occur in South Asia, East Asia, Europe and parts of North America. Sparse populations occur in Antarctica, the Sahara, the Amazon Basin and high mountain areas such as the Himalayas.
When describing a pattern, try to include:
- the overall pattern
- named places or regions
- contrasts or anomalies
- relevant map evidence, such as direction, scale, altitude or distance from the coast
Describing a population distribution
- Identify the overall arrangement: the population is unevenly distributed, with dense clusters in some regions and sparse areas elsewhere.
- Add named locations: high densities occur in India, eastern China and western Europe, while low densities occur in the Sahara, central Australia and Antarctica.
- Link the pattern to possible factors: dense areas often have flatter land, reliable water supplies, jobs and transport links, while sparse areas may be too dry, too cold, too mountainous or too remote.
Thematic maps and associations
Thematic map
A thematic map shows one main theme, such as rainfall, population density, income, migration, relief, disease risk or transport routes.
A common GCSE skill is comparing two thematic maps to look for an association. An association means two patterns appear to be linked. For example, areas with high rainfall may overlap with areas of tropical rainforest. Areas with low population density may overlap with deserts, mountains or polar regions.
Correlation is not proof
If two map patterns overlap, you can say there is an association, but do not automatically claim one definitely causes the other. Use cautious wording such as “this suggests” or “may be linked to”.
Ordnance Survey maps
Ordnance Survey map
An Ordnance Survey map, often shortened to OS map, is a detailed map of Great Britain showing physical and human features using symbols, grid lines, contours and scale.
At GCSE, you may use OS maps at different scales, especially 1:50 000 and 1:25 000.
- On a 1:50 000 map, 1 cm on the map represents 500 m on the ground.
- On a 1:25 000 map, 1 cm on the map represents 250 m on the ground.
A 1:25 000 map shows more detail because it is a larger-scale map.
Four-figure and six-figure grid references
OS maps use a square grid. The vertical lines are eastings because they increase as you move east. The horizontal lines are northings because they increase as you move north.
Along the corridor, up the stairs
Read grid references as eastings first, then northings. Go along the bottom, then up the side.
A four-figure grid reference identifies a whole grid square. A six-figure grid reference identifies a more precise point inside a square.
Giving a six-figure grid reference
- Find the grid square first: if the point lies between easting 14 and 15, and between northing 56 and 57, the four-figure grid reference begins 1456.
- Estimate how far across the square the point is in tenths: if it is about 7 tenths across from easting 14, the easting becomes 147.
- Estimate how far up the square the point is in tenths: if it is about 3 tenths up from northing 56, the northing becomes 563, so the six-figure grid reference is 147563.
Scale, distance and direction
Scale
Scale shows the relationship between distance on the map and distance in the real world.
You may need to measure:
- straight-line distance, such as from a village to a coastline
- curved-line distance, such as along a river, road or footpath
- direction, using compass points or bearings
For a curved route, use a piece of string or paper edge to follow the route, then compare it with the scale bar.
Measuring distance using scale
- Measure the map distance: a road route measures 8 cm on a 1:50 000 OS map.
- Convert using the scale: 1 cm represents 500 m, so 8 cm represents 4000 m.
- Express the answer in kilometres: 4000 m is 4 km, so the road route is about 4 km.
Distance sanity check
On a 1:50 000 OS map, 2 cm is about 1 km. On a 1:25 000 OS map, 4 cm is about 1 km.
Relief: height, slope and landforms
Relief
Relief means the shape and height of the land, including hills, valleys, slopes, ridges and lowlands.
OS maps show relief using:
- contour lines: lines joining places of equal height above sea level
- spot heights: exact height points marked by a number
- trig points: accurately surveyed high points, often shown by a triangle symbol
Close contour lines show a steep slope. Widely spaced contour lines show a gentle slope.
Gradient
Gradient
Gradient is the steepness of a slope. It compares vertical height change with horizontal distance.
A simple way to calculate gradient is:
gradient=vertical height changehorizontal distance\text{gradient} = \frac{\text{vertical height change}}{\text{horizontal distance}}gradient=horizontal distancevertical height changeCalculating gradient
- Work out the height change: a path rises from 120 m to 320 m, so the vertical height change is 200 m.
- Work out the horizontal distance: the map shows the path covers 1000 m on the ground.
- Substitute into the formula: gradient=2001000\text{gradient} = \frac{200}{1000}gradient=1000200, which simplifies to 1:5. This means the land rises 1 m for every 5 m travelled horizontally.
Mixing units in gradient
Make sure height change and horizontal distance are in the same unit before calculating gradient. Do not compare metres with kilometres without converting.
Cross-sections and transects
Cross-section and transect
A cross-section is a side view of the land along a line on a map. A transect is a line across a landscape used to record how features change from one place to another.
Cross-sections help you connect map evidence to real landscapes. For example, a river valley may appear as V-shaped contours on a map and as a dip in a cross-section. A glacial trough may appear as a wide, steep-sided valley. A coastline may show cliffs, beaches, headlands and bays.
Interpreting a cross-section
- Compare the profile with the contour spacing: where the cross-section is steep, the contour lines on the map should be close together.
- Identify major relief features: a high point on the profile may represent a hill, ridge or plateau, while a low point may represent a valley floor.
- Link relief to drainage and settlement: rivers usually follow lower ground, while settlements and roads often avoid the steepest slopes where construction is harder.
Inferring landscapes and human activity from OS evidence
To infer means to work something out from evidence, even if it is not directly stated.
You may be asked to identify landscape features and describe their characteristics from map evidence. This could include:
- coastal landscapes: cliffs, beaches, headlands, bays, spits, ports, promenades
- fluvial landscapes: rivers, meanders, floodplains, tributaries, bridges, valley sides
- glacial landscapes: corries, arêtes, ribbon lakes, U-shaped valleys, steep slopes
Your course studies two of coastal, river and glacial landscapes in detail, so practise recognising the map evidence for the two you have studied.
Human activity can also be inferred from map evidence:
- tourism: campsites, viewpoints, parking, footpaths, visitor centres, beaches, museums
- settlement: villages, towns, isolated farms, linear settlement along roads
- communication: roads, railways, bridges, ferries, airports
- land use: woodland, farmland, quarries, reservoirs, industrial estates, recreation areas
Inferring tourism from map evidence
- Identify tourist-related symbols and features: a map shows a beach, car parks, public toilets, footpaths and a campsite near the coast.
- Consider accessibility: a main road and nearby settlement suggest visitors can reach the area easily.
- Make a supported inference: the area is likely to attract tourists because it combines coastal attractions with services and transport access.
Maps with photographs
You may need to compare maps with ground, aerial or satellite photographs.
Types of photograph
A ground photograph is taken from ground level. An aerial photograph is taken from above, usually from an aircraft or drone. A satellite photograph is taken from space.
Photographs can show landforms, natural vegetation, land use, settlement patterns and geographical processes. However, they do not always show scale, direction or height clearly, so you often need map evidence as well.
Sketch maps and annotations
A sketch map is a simplified drawing of the main features of an area. It should not be a detailed artwork. It should show the key geography clearly.
An annotation is a label with extra explanation. For example, instead of just writing “river”, an annotation might say “meandering river on flat floodplain, suggesting low gradient”.
Good sketch maps
Use a title, frame, labels, simple shading or symbols, and only the most important features. Accuracy matters more than artistic detail.
When comparing a photograph with a map:
- match obvious features first, such as roads, rivers, coastlines or large buildings
- use direction and relative position, such as “north of the river” or “west of the main road”
- describe both physical and human features
- annotate with evidence, not guesses
In the exam
- Start with location and pattern: use compass directions, named places, grid references, scale and clear distribution words such as clustered, linear, dispersed, dense or sparse.
- Support every inference with map evidence: mention symbols, contours, roads, rivers, settlement patterns, land use or photograph features.
- When measuring or calculating, write units clearly and check whether the question asks for distance, direction, gradient, grid reference, comparison or explanation.
Check yourself
- Can you explain the difference between a four-figure and six-figure grid reference?
- Can you describe a distribution using named places, directions and pattern words?
- Can you infer likely human activity from OS map evidence such as roads, footpaths, car parks and land use?
